국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Performance of Reynolds Averaged Navier-Stokes Models in Predicting Separated Flows: Study of the Hump Flow Model Problem
저자	Cappelli, Daniele;; Mansour, Nagi N.
Keyword	BOUNDARY LAYER SEPARATION;; BUBBLES;; K-EPSILON TURBULENCE MODEL;; K-OMEGA TURBULENCE MODEL;; NAVIER-STOKES EQUATION;; PREDICTIONS;; REYNOLDS AVERAGING;; SEPARATED FLOW;; VELOCITY DISTRIBUTION
URL	http://hdl.handle.net/2060/20130001741
보고서번호	ARC-E-DAA-TN6770
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Separation can be seen in most aerodynamic flows, but accurate prediction of separated flows is still a challenging problem for computational fluid dynamics (CFD) tools. The behavior of several Reynolds Averaged Navier-Stokes (RANS) models in predicting the separated ow over a wall-mounted hump is studied. The strengths and weaknesses of the most popular RANS models (Spalart-Allmaras, k-epsilon, k-omega, k-omega-SST) are evaluated using the open source software OpenFOAM. The hump ow modeled in this work has been documented in the 2004 CFD Validation Workshop on Synthetic Jets and Turbulent Separation Control. Only the baseline case is treated;; the slot flow control cases are not considered in this paper. Particular attention is given to predicting the size of the recirculation bubble, the position of the reattachment point, and the velocity profiles downstream of the hump.